How to Adjust Backlight Time on Touch?

Hi: I'm using the Gen 5 Touch, 8.1.2...For the life of me, I cannot figure out how to adjust the amount of time that the backlight stays on...Right now, it is on constantly...Can I set the backlight for a specific amount of seconds and then have it turn off to save battery life? Thanks...

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.